drain out

drain out

To flow or move out of something, as of a liquid. Because the stopper had come loose, most of the water had drained out of the tub by the time I came back for my bath.
See also: drain, out

drain out

to flow out or empty. All the milk drained out of the container onto the bottom of the refrigerator. All the oil drained out of the crankcase.
See also: drain, out
References in periodicals archive ?
As long as normal sewage goes in and the effluent is free to drain out of the perforations in the pipes, your septic system will work just fine.